C#实现获取系统目录并以Tree树叉显示的方法

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.IO; 
namespace 获取系统目录
{
 public class Form1 : System.Windows.Forms.Form
 {
 private System.Windows.Forms.TreeView treeView1;
 private System.ComponentModel.IContainer components;
 private System.Windows.Forms.Button button2;
 private System.Windows.Forms.Label label2;
 private System.Windows.Forms.Button button1;
 private System.Windows.Forms.TextBox textBox1;
 private System.Windows.Forms.Label label1; 
 public Form1()
 {
  InitializeComponent();
  FillTree(treeView1, true); // 显示所有文件夹以及文件
 }
 protected override void Dispose( bool disposing )
 {
  if( disposing )
  {
  if (components != null) 
  {
   components.Dispose();
  }
  }
  base.Dispose( disposing );
 }
 #region Windows 窗体设计器生成的代码
 private void InitializeComponent()
 {
  this.textBox1 = new System.Windows.Forms.TextBox();
  this.label2 = new System.Windows.Forms.Label();
  this.label1 = new System.Windows.Forms.Label();
  this.treeView1 = new System.Windows.Forms.TreeView();
  this.button1 = new System.Windows.Forms.Button();
  this.button2 = new System.Windows.Forms.Button();
  this.SuspendLayout();
  this.textBox1.Location = new System.Drawing.Point(280, 56);
  this.textBox1.Multiline = true;
  this.textBox1.Name = "textBox1";
  this.textBox1.Size = new System.Drawing.Size(208, 192);
  this.textBox1.TabIndex = 3;
  this.textBox1.Text = "";
  this.label2.AutoSize = true;
  this.label2.Location = new System.Drawing.Point(280, 24);
  this.label2.Name = "label2";
  this.label2.Size = new System.Drawing.Size(116, 17);
  this.label2.TabIndex = 4;
  this.label2.Text = "文件夹或文件信息：";
  this.label1.AutoSize = true;
  this.label1.Location = new System.Drawing.Point(16, 24);
  this.label1.Name = "label1";
  this.label1.Size = new System.Drawing.Size(153, 17);
  this.label1.TabIndex = 5;
  this.label1.Text = "请选择一个文件夹或文件：";
  this.treeView1.ImageIndex = -1;
  this.treeView1.Location = new System.Drawing.Point(16, 56);
  this.treeView1.Name = "treeView1";
  this.treeView1.SelectedImageIndex = -1;
  this.treeView1.Size = new System.Drawing.Size(184, 192);
  this.treeView1.TabIndex = 6;
  this.button1.Location = new System.Drawing.Point(216, 104);
  this.button1.Name = "button1";
  this.button1.Size = new System.Drawing.Size(48, 32);
  this.button1.TabIndex = 7;
  this.button1.Text = "显示";
  this.button1.Click += new System.EventHandler(this.button1_Click);
  this.button2.Location = new System.Drawing.Point(216, 168);
  this.button2.Name = "button2";
  this.button2.Size = new System.Drawing.Size(48, 32);
  this.button2.TabIndex = 8;
  this.button2.Text = "清空";
  this.button2.Click += new System.EventHandler(this.button2_Click);
  this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
  this.ClientSize = new System.Drawing.Size(504, 277);
  this.Controls.Add(this.button2);
  this.Controls.Add(this.button1);
  this.Controls.Add(this.treeView1);
  this.Controls.Add(this.label1);
  this.Controls.Add(this.label2);
  this.Controls.Add(this.textBox1);
  this.Name = "Form1";
  this.Text = "Form1";
  this.ResumeLayout(false);
 }
 #endregion
 [STAThread]
 static void Main() 
 {
  Application.Run(new Form1());
 }
 // 填充目录和文件到 TreeView 控件中
 // isSource 表示是否显示文件
 private void FillTree(TreeView treeView,bool isSource)
 {
  treeView.Nodes.Clear(); // 清空
  // 获取系统上的所有逻辑驱动器
  string[] strDrives = Environment.GetLogicalDrives();
  foreach(string rootDirectoryName in strDrives)
  {
  try
  {
   // 获取驱动器顶级目录列表
   DirectoryInfo dir = new DirectoryInfo(rootDirectoryName);
   
   // 如果获得的目录信息正确，则将它添加到 TreeView 控件中
   if (dir.Exists == true)
   {
   TreeNode newNode = new TreeNode(rootDirectoryName);
   treeView.Nodes.Add(newNode);
   if (isSource)
   {
    GetSubDirectoryNodes(newNode, newNode.Text, true);
   }
   else
   {
    GetSubDirectoryNodes(newNode, newNode.Text, false);
   }
   }
  }
  catch(Exception e)
  {
   MessageBox.Show(e.Message);
  }
  }
 }
 // 遍历子目录
 private void GetSubDirectoryNodes(TreeNode parentNode, string fullName, bool getFileNames)
 {
  DirectoryInfo dir = new DirectoryInfo(fullName);
  DirectoryInfo[] subDirs = dir.GetDirectories();
  // 为每一个子目录添加一个子节点
  foreach(DirectoryInfo subDir in subDirs)
  {
  // 不显示隐藏文件夹
  if((subDir.Attributes & FileAttributes.Hidden) != 0)
  {
   continue;
  }
  TreeNode subNode = new TreeNode(subDir.Name);
  parentNode.Nodes.Add(subNode);
  // 递归调用GetSubDirectoryNodes
  GetSubDirectoryNodes(subNode, subDir.FullName, getFileNames);
  }
  // 获取目录中的文件
  if(getFileNames)
  {
  FileInfo[] files = dir.GetFiles();
  foreach(FileInfo file in files)
  {
   TreeNode fileNode = new TreeNode(file.Name);
   parentNode.Nodes.Add(fileNode);
  }
  }
 }
 private void button1_Click(object sender, System.EventArgs e)
 {
  try
  {
  TreeNode selectedNode = treeView1.SelectedNode;  
  DirectoryInfo info = new DirectoryInfo(selectedNode.FullPath);
  string [] strArray = new string[4];
  strArray[0] = "完整路径名 : "+ info.FullName;
  strArray[1] = "创建时间 : "+ info.CreationTime.ToString();
  strArray[2] = "上次访问时间 : "+ info.LastAccessTime.ToString();
  strArray[3] = "上次写入时间 : "+ info.LastWriteTime.ToString();
  textBox1.Lines = strArray;
  }
  catch(Exception exc)
  {
  MessageBox.Show(exc.Message);
  }
 }
 private void button2_Click(object sender, System.EventArgs e)
 {
  textBox1.Text = "";
 }
 }
}